Device for mounting valve seat inserts



v zmww W. G. CALKBNS DEVICE FOR MOUNTING VALVE SEAT INSERTS July 16, 1935..

Filed Sept. 28, 1952 INVENTOR. WILLIAM G. OALK/N.

2 ATTORNEYS.

Patented July 16, 1935 UNITED STATES PATENT OFFICE DEVICE FOR MOUNTING VALVE SEAT INSERTS William G. Calkins, Detroit, Mich, asslgnor to ChtyslerCor-poratlon, Detroit, Mich" a corporation of Delaware Application September 28, 1932, Serial No. 635,233

2 Claims. (01. 80-1) This invention relates to an improved method partly in section, of the device shown in-Fig. 1 and means for mounting valve seats in the strucand illustrating the manner in which the latter ture of the valve chamber of an engine and it has is employed in mounting a valve insert seat in particular relation to the mounting of hardened the structure of an engine. 7

heat resisting valve inserts. Fig. 3 is a fragmentary transverse sectional view 5 The main objects or the invention are to pmf th partf the en stru tine in wh h th vide a method for securing hardened heat resistvalve seat insert is mounted illustrating t m ing valve insert seats in awall of a valve chamnet in which it is received during installation.

her in concentric relation to the valve stem guide Fig. 4 is a fragmentary view similar to Fig. 3

' thereof; to provide a method of this character 7 but showing the valve seat insert firmly secured 10 which does not require holding of the dimensions in place.

of. the valve insert seat and the recess within In the form shown, my improved valve seat which it is received to close limits and whichobinsert mounting device includes a. body portion viates the necessity of an initial press fit between l0 having a piloting member ll extending from the peripheries of the valve seat inserts and its one side thereof which is receivable in a conven- 15 recess during insertion of the valve seat; to protlonal valve stem guide 12 of a valve chamber of vide a method of this character which eliminates an engine. Formed in the body portion In is a the necessity of inserting the valve seat inserts transverse bore B which. extends substantially under pressure of large magnitude; and to provide perpendicular to the axis of the piloting member a method of this kind by which the metal of the H and in which are mounted trunnion elements 20 structure 'in the vicinity of the valve seat is grad M and W. The trunnion elements M and i5 are u'ally worked into overlapping relation with one provided on their outer extermity with screw surface of the valve seat insert and into binding slotted heads and their adjacent ends are respecengagement with the outer peripheral surface tivcly provided with internal and external screw thereof soas to firmly secure the inserts inplace threads, by which the trunnions are fixed to- 25 without welding or brazing the metals or treating gether. Journaled on the outer end portions of them in any manner which tends to change their the trunnion elements it and it are swaging structural properties. members or rollers it which have crowned outer Other objects of the invention are to provide an peripheral portions it that are adapted to work improved device for working the metal surroundmetal inwardly toward the axis of the piloting ing a valve seat insert receiving recess into overmember it during the operation of the device lapping relation with respect to one surface of a hereinafter set forth;

a v Seat insert a in binding engagement My improved valve seat insert mounting device with another surface thereof; toprovidea tool may be operated by any suitable driving mechai this Mild which is adapted to be accurately nism which is adapted to impart rotary movement 35 centered with respect to the insert receiving reas well as to urge the device axially of the pilot- 8 y 8% Valve Stem guide of an engine; to Provide ing member, such as a conventional drill press swaging elements which, during p ati n; have of the type illustrated in Fig. 1. The body porrolling contact with the metal of the structure tion it oi the valve seat insert mounting device smounding the f' recelvmg recess; F Pmnde is provided with a shaft it which is substantially at P 9 swa'gmg elements W Whlch m co-axial with the piloting member ii and which went pressure the metal Surrounding protrudes from the side of the body portion opthe insert receiving recess is obtainable from a comparatively small force of application to work poslte to the side thereof Irom Whhh the pflatmg such metal into a desired relation to the insert; member extends' The slmfi m is preferably de tachably connected in any suitable manner to the and to provide a, tool of this kind which 15 operr able under force magnitudes that are far below spmdle w of the dull press Wmch 1s .mtata'oly the maximum force the structure operated upon and Shifiably mounted on the bed portion 2a of is capable of withstanding the press. The drill pressis provided with suit- An illustrative embodiment of the invention is able Mame driving mechanism Such as the 59 shown inthe accompanying drawing, in which: 24 and pulleys Maud 23 by means of which the Fig 1 is a Side elevational View, partly in spindle l9 and the valveseat insert mounting detion, of a machine including a valve seat insert Vice are Thfi sPindle 59 y be nudevice embodying my invention. ally raised and lowered by manipulation of the Fig. 2 is. a Iragmentary side elevational view, lever M which operates a pinion 25 that is meshed as withrack teeth 26 on a sleeve 21 in which the spindle is journaled. The sleeve 21 is confined between collars 28 and 29 which are fixed on the spindle and which impart the raising and lowering movement thereto.

Lnmountiug valve seat inserts in accordance with my improved method the upper wall 30 of the valve chamber which, in the illustration shown, is at the upper extremity of the cylinder block 3|, is provided with a circular recess 32 which is substantially concentric with the axis of the valve stem guide l2. A ring-shaped valve seat insert 33. preferably comprising a suitable hardened alloy steel that is capable of retaining its physical properties at elevated temperatures such as tool steels commercially known as high speed steel is then placed in the recess 32. The outer diameter of the valve seat insert is preferably small enough so that the insert will freely slide into the recess without requiring pressures of large magnitude. If desired, a. slight clearance 34, illustrated in Fig. 3, may be provided between the outer periphery of the insert and the peripheral wall of the recess. The outer edge portion of the insert 33 is beveled as illustrated at 35.

After the valve seat insert is thus placed in position the piloting member H is inserted in the valve stem guide and the spindle is of the press is lowered until the crown shaped peripheries of the rollers i6 seat upon the upper face of the valve chamber wall 30. The insert mounting device is then rotated by the spindle while the latter is urged, downwardly by the manipulation of the lever 24. This operation causes the swaging members I 6 to roll upontlie upper face ofthe valve chamber wall 30 and to work the metal of the zone surrounding the recess 32 inwardly to:- ward the axis of the piloting member II. The metal is crowded over the beveled member 35 of the valve seat insert and forced into binding engagement with its outer periphery, thereby firmly securing the insert in place. 7

Although but one specific embodiment of the invention is herein shown and described, it is understood that various'changes may be made without departing from the spirit 01 my invention audit is not intended to limit its scope other than by the terms of the appended claims.

What I claim is:'

1. A device for mounting a metal insert in a recess of a metal structureincluding a body portion having a central bore, trunnions mounted in said bore and having their internally disposed ends in threaded engagement, means for rotating said body portion and urging the same axially of its axis of rotation against said metal structure, means for holding said body portion against lateral movement relative to said structure, and a working element mounted on each of said trunnions so constructed and arranged as to displace the metal of said structure surrounding the recess thereof laterally toward the axis of said device by axial pressure thereof upon said structure.

2. A device for mounting a metal insert in a recess of a metal structure including abody portion having a central threaded end portion bore, a trunnion having a and an enlarged head portion mounted in said bore, means engaging the threaded end portion of said trunnion for fixing it against axial movement relative'to' said bore,

meansv for rotating said body portion and urging the same axially of its axis of rotation against said metal structure, means for holding said body portion against lateral movement relative to said structure, and a working element mounted on said trunnion so constructed and arranged as to displace the metal 01' said structure surrounding the recess thereof laterally toward the axis of said device by axial pressure thereof upon said structure.

WILLIAM G. CALKCNS. 

